DE959627C - Circuit for the production of partial beams made of reinforced or prestressed concrete - Google Patents

Description

Bs is known within the formwork wall a tensioning track for the production of partial beams made of reinforced or prestressed concrete push handle, which the The composite of the partial beam with the in-situ concrete is used to arrange the reinforcement elements include wholly or partially and their free ends extend in the direction of autf the tensioning path.

T-shaped concrete beams with push bars have previously been manufactured, for example, by that one arranged the push bar encompassing the reinforcement inserts in the formwork in such a way that that their ends protruded upwards. There are no concerns about such a production, when the concrete is compacted by shaking the formwork on the side. The compression However, in this case the concrete is not sufficient for prestressed concrete. To better compact the concrete to be able to, you have the entire formwork, including the entire formwork base, in vibrating ' Vibration offset and the push handle only shortly after the concrete has been compacted in it depressed. A non-positive connection of the push handle with the reinforcement elements is then not possible.

In order to avoid this disadvantage, the concrete beam was made in two stages first half of the beam is made, then the reinforcement elements with the Scbubbie

laid and the second half concreted on top. The push handle was made between a two-part Formwork wall clamped so that their free ends extended in a horizontal plane. This production of partial beams is uneconomical, quite apart from the fact that they cannot be used with prestressed concrete.

Partial beams have already been manufactured in such a way that the concrete is placed in a trough-shaped formwork and which include the reinforcement elements. Push handle were designed so that their free ends penetrate openings provided in the horizontally lying base plate. This type of production had disadvantages: the feed-through points had to be sealed, for example by rubber rings, paper or the like; the push handle could only be used after the Partial beams are bent at their ends; in addition, the brackets get stuck in the ao openings of the shuttering base, since the length of the partial beam is reduced when relaxing, which there is a risk of the partial beam tearing open.

These disadvantages are avoided if the partial beams are made of reinforced or prestressed concrete the main patent 938 329 manufactures. The distinguishing feature of the main patent is that the push handle are completely or partially encased by the concrete of the partial beam, in such a way that the Brackets are slightly exposed before the connection with the in-situ concrete and, if necessary, bent up can. The partial beam has a side facing the in-situ concrete to be poured later or more ribs, and the push handle parts engage in this rib.

With a view to increasing the load-bearing capacity of reinforcement elements during assembly it is advisable to remove the ribs in which the means that transmit the thrust forces are accommodated, relatively wide or higher than was previously the case. This leads to the fact that the Wholly or partially embedded in the concrete thrust transmission means on the construction site more difficult can be detached and bent up. The invention is based on the object to eliminate this disadvantage.

According to the invention it is proposed that the tensioning track at the point where .the push handle from the partial beam to be produced protrude deeper than the cross-sectional shape of the partial beam on this Place corresponds to design and fill this space with sand or the like and from the Part of the bar protruding push handle parts in the sand or the like.

The concept of the invention is illustrated schematically with the aid of the drawings. It shows

Fig. Ι a section through one with a rib or a bar provided with partial beams in its formwork,

2 shows a section through a partial beam with a rectangular cross-section in its formwork,

The formwork bed 1 has a recess 2 which is filled with sand 3 up to a selectable height is filled out. After tensioning the reinforcement layers 4, which may be pre-tensioned can be, the bracket 5 are inserted into the formwork space, for example so that part of its ends come to rest between the two reinforcement layers, while the other ends rest on the bottom of the formwork. These ends therefore engage in the recess 2 introduced sand. Now the concrete is poured into the formwork space, from above compacted and the partial beam lifted out of the formwork after the concrete had hardened. the Push bars are then already exposed because the Sa * i falls off. The prerequisite is that the Concrete has an earth-moist consistency so that it does not combine with the poured sand.

Of course, the idea of the invention can also be used when the cross-section the partial bar is rectangular, as can be seen from FIG.

Claims (1)

PATENT CLAIM: S5 Formwork for the production of partial beams made of reinforced or prestressed concrete with push bars for bonding with in-situ concrete, the free ends of which are in the direction when the partial beam is produced extend to the tensioning track, in particular for the production of partial beams after Patent 938 329, characterized in that the tensioning track at the point where the Push handle protrude from the partial beam to be manufactured, is deeper than it corresponds to the cross-sectional shape of the finished partial beam, and this space is filled with sand or the like and the later protruding from the partial beam Enclose push handle parts in the sand or the like. Publications considered: German Patent No. 573 695. 1 sheet of drawings